There are two 8-bank polarimeters available at Effelsberg; one for the 18/21cm-receiver
(alternatively, it could be connected to the 21cm-7Beam system, both are prime focus systems),
the other for the 11cm-receiver (located in the secondary focus). These can be used to split
the full IF band into eight subbands and investigate the polarization properties of the signal
seperately (eg., for Rotation Measure studies).

Besides the eight subbands, there is also a polarimeter for a larger bandwidth. As each
polarimeter has four outputs, there are 36 channels in total.

For the data analysis the standard procedures can be applied – they just have to be repeated
9 times!

The table below summarizes the frequency distribution and channel assignment of the subbands
for the 18/21cm- and the 11cm-receivers.

18/21cm receiver

11cm receiver

Center frequency 1400/1666 MHz

Center frequency 2639.5 MHz

Frequency of sub band

Channels

Output

Frequency of sub band

1386 ± 2 MHz / 1652 ± 2 MHz

1

TP A

2604.5 ± 5 MHz

2

TP B

3

cos A/B

4

sin A/B

1390 ± 2 MHz / 1656 ± 2 MHz

5-8

2614.5 ± 5 MHz

1394 ± 2 MHz / 1660 ± 2 MHz

9-12

2624.5 ± 5 MHz

1398 ± 2 MHz / 1664 ± 2 MHz

13-16

2634.5 ± 5 MHz

1402 ± 2 MHz / 1668 ± 2 MHz

17-20

2644.5 ± 5 MHz

1406 ± 2 MHz / 1672 ± 2 MHz

21-24

2654.5 ± 5 MHz

1410 ± 2 MHz / 1676 ± 2 MHz

25-28

2664.5 ± 5 MHz

1414 ± 2 MHz / 1680 ± 2 MHz

29-32

2674.5 ± 5 MHz

Full band (beware of RFI!)

Full band

1400 ± 50 MHz /1666 ± 50 MHz

33-36

2639.5 ± 40 MHz

information_for_astronomers/user_guide/8k-polar.txt · Last modified: 2014/02/11 16:16 by akraus
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